I spent some time on Google, but couldn't find an answer to this. The specs for XServe G5 RAM call for ECC PC-3200 unregistered RAM. The user manual and service manual emphatically state to use unregistered RAM. The problem I keep running into is that it seems to be difficult to find aftermarket PC-3200 RAM that is both ECC and unregistered-those features seem to go hand in hand. I have a little bit of DDR2 ECC unregistered RAM, but of course that doesn't do me any good. In fact, I have a couple of 2gb registered ECC DIMMs that I'd like to use(my Xserve is supposed to support 2gb DIMMs), but it doesn't seem as though I can. Most of the internet references I've found just repeat Apple's line about not using registered RAM. I'm assuming that Apple had a good reason for specifying unregistered RAM, but I also know that often times in the "real world" RAM specifications that Apple doesn't support will actually work just fine. I obviously don't want to break anything, but also would like to upgrade the RAM in my computer. Does anyone know if 1. Registered ECC RAM will work in the Xserve G5? 2. Will it cause damage to the computer by doing so?